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Codeforces Round 945 (Div. 2)
3 days
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Difficulty:
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geometry
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
implementation
interactive
math
matrices
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Custom test
Problems
#
Name
293D
Ksusha and Square
geometry
,
math
,
probabilities
,
two pointers
2700
x234
280A
Rectangle Puzzle
geometry
2000
x1443
279A
Point on Spiral
brute force
,
geometry
,
implementation
1400
x5498
277B
Set of Points
constructive algorithms
,
geometry
2300
x783
274C
The Last Hole!
brute force
,
geometry
2600
x346
270A
Fancy Fence
geometry
,
implementation
,
math
1100
x43517
269E
String Theory
geometry
,
math
,
strings
3100
x107
257C
View Angle
brute force
,
geometry
,
math
1800
x4195
250D
Building Bridge
geometry
,
ternary search
,
two pointers
1900
x874
249D
Donkey and Stars
data structures
,
dp
,
geometry
,
math
,
sortings
2700
x375
248C
Robo-Footballer
binary search
,
geometry
2000
x793
243D
Cubes
data structures
,
dp
,
geometry
,
two pointers
2700
x208
241C
Mirror Box
geometry
,
implementation
2000
x507
231D
Magic Box
brute force
,
geometry
1600
x4036
227A
Where do I Turn?
geometry
1300
x4044
224A
Parallelepiped
brute force
,
geometry
,
math
1100
x25407
223E
Planar Graph
flows
,
geometry
,
graphs
3000
x188
223D
Spider
geometry
,
graphs
3000
x68
220D
Little Elephant and Triangle
geometry
,
math
2500
x273
213D
Stars
constructive algorithms
,
geometry
2300
x334
203D
Hit Ball
geometry
,
implementation
,
math
1700
x1399
199B
Special Olympics
geometry
1900
x778
198C
Delivering Carcinogen
binary search
,
geometry
2400
x369
196C
Paint Tree
constructive algorithms
,
divide and conquer
,
geometry
,
sortings
,
trees
2200
x740
195D
Analyzing Polyline
geometry
,
math
,
sortings
1900
x1001
190B
Surrounded
geometry
1800
x2786
183B
Zoo
brute force
,
geometry
1700
x677
182A
Battlefield
geometry
,
graphs
,
implementation
,
shortest paths
2200
x278
181A
Series of Crimes
brute force
,
geometry
,
implementation
800
x6712
175E
Power Defence
brute force
,
dp
,
geometry
,
greedy
2600
x260
166B
Polygons
geometry
,
sortings
2100
x2159
157B
Trace
geometry
,
sortings
1000
x12862
154E
Martian Colony
geometry
3000
x89
142E
Help Greg the Dwarf 2
geometry
3000
x79
141B
Hopscotch
geometry
,
math
1400
x5142
140F
New Year Snowflake
geometry
,
sortings
2600
x360
140A
New Year Table
geometry
,
math
1700
x4089
135B
Rectangle and Square
brute force
,
geometry
,
math
1600
x2296
128E
Birthday
geometry
,
math
2900
x96
127A
Wasted Time
geometry
900
x10745
120J
Minimum Sum
divide and conquer
,
geometry
,
sortings
1900
x908
119E
Alternative Reality
geometry
2400
x93
107E
Darts
geometry
,
probabilities
2700
x127
106E
Space Rescuers
geometry
,
ternary search
2100
x837
100I
Rotation
*special problem
,
geometry
,
math
1500
x340
98C
Help Greg the Dwarf
geometry
,
ternary search
2500
x300
91E
Igloo Skyscraper
data structures
,
geometry
2500
x585
89D
Space mines
geometry
2500
x228
87E
Mogohu-Rea Idol
geometry
2600
x548
85E
Guard Towers
binary search
,
dsu
,
geometry
,
graphs
,
sortings
2600
x919
82E
Corridor
geometry
2600
x216
80B
Depression
geometry
,
math
1200
x4222
78D
Archer's Shot
binary search
,
geometry
,
math
,
two pointers
2300
x302
77E
Martian Food
geometry
2800
x363
75E
Ship's Shortest Path
geometry
,
shortest paths
2400
x270
73F
Plane of Tanks
brute force
,
geometry
2900
x74
70D
Professor's task
data structures
,
geometry
2700
x954
68E
Contact
geometry
2900
x70
67E
Save the City!
geometry
2500
x312
65C
Harry Potter and the Golden Snitch
binary search
,
geometry
2100
x772
62C
Inquisition
geometry
,
implementation
,
sortings
2300
x247
55E
Very simple problem
geometry
,
two pointers
2500
x674
54E
Vacuum Сleaner
geometry
2700
x187
50C
Happy Farm 5
geometry
2000
x725
47E
Cannon
data structures
,
geometry
,
sortings
2200
x353
46G
Emperor's Problem
geometry
2500
x109
44F
BerPaint
geometry
,
graphs
2700
x64
40A
Find Color
constructive algorithms
,
geometry
,
implementation
,
math
1300
x3855
36C
Bowls
geometry
,
implementation
2200
x323
33D
Knights
geometry
,
graphs
,
shortest paths
,
sortings
2000
x1134
32E
Hide-and-Seek
geometry
,
implementation
2400
x321
30D
King's Problem?
geometry
,
greedy
2600
x410
28E
DravDe saves the world
geometry
,
math
2800
x85
24C
Sequence of points
geometry
,
implementation
,
math
1800
x1214
23D
Tetragon
geometry
,
math
2600
x325
18A
Triangle
brute force
,
geometry
1500
x5704
14C
Four Segments
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3094
13D
Triangles
dp
,
geometry
2600
x594
13B
Letter A
geometry
,
implementation
2000
x834
9B
Running Student
brute force
,
geometry
,
implementation
1200
x5203
8D
Two Friends
binary search
,
geometry
2600
x510
6A
Triangle
brute force
,
geometry
900
x19094
2C
Commentator problem
geometry
2600
x1575
1C
Ancient Berland Circus
geometry
,
math
2100
x5386
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